Workshop › Missile Command-style Defense › Step 12 of 35

Fire an interceptor

What we are doing

You fight back with interceptors. fire(tx, ty) sends one from the base towards a point in the sky, but not towards the ground.

```js
let shots // your interceptors on their way: { x, y, tx, ty }

  shots = []

function fire(tx, ty) {
  if (ty > BASE.y - 10) return
  shots.push({ x: BASE.x, y: BASE.y, tx, ty })
}
```

What it means

• shots holds your interceptors; reset empties it.
• Points lower than 10 pixels above the base are ignored: return leaves at once.
• An interceptor starts at the base and remembers its target tx, ty, like the enemy missiles.

Your turn

1. Under let incoming ... write let shots with its comment.
2. In reset, under incoming = [], write shots = [].
3. Above the // Move a point ... comment, write fire, followed by an empty line.

Skills: Game states

← Impact Click the sky →

All steps

1. Six cities to protect
2. Your missile base
3. Draw again and again
4. Cities that can fall
5. Rubble
6. Move towards a point
7. Launch an enemy missile
8. One missile a second
9. Missiles on their way
10. Smoke trails
11. Impact
12. Fire an interceptor
13. Click the sky
14. Interceptors fly
15. An explosion that grows and shrinks
16. Explode on arrival
17. Draw the explosions
18. Impacts explode too
19. Caught in the blast
20. Chain reactions
21. Only your explosions count
22. Points for every missile
23. Show the score
24. Limited ammo
25. Waves
26. Each wave is harder
27. The end of a wave
28. The end
29. Play again
30. Wave, ammo and messages
31. Launch from anywhere
32. Some missiles will split
33. Split into three
34. A high score
35. Build it yourself: a crosshair